Fig. 3.

Thalamic oscillation is controlled by the intensity of the cortical feedback. A, Detail of a spindle wave and its control autocorrelogram displayed as thethin trace in B and C.B, Single shocks resulting in monosynaptic EPSPs (arrow) and performed at various delays after the bursts have little effect on the oscillation. C, Increasing the intensity of stimulation to a threshold of four or five shocks leads to the disappearance of fast IPSPs and slows down the network oscillation to 3–4 Hz.